Martian Manhunter vs Thanos

Thanos does not have anything related to the Infinity Gauntlet or Heart of the Universe and J'onn is how he was when he was alive. Battlefield is on the planet Big Blue from the F-Zero franchise, which includes entire cities dedicated to the purpose of being a giant racing track for crafts going about 1500 kilometers per hour and more. A race is in progress and the fights begins.

_________________"I looked at you with those Angel Eyes...and you've never been the same since..."

I think i'll side with Thanos in a VERY close battle, he's been able to attack the minds of the Fallen One, he's has enough power to put Galactus on his butt and his intelligence are a great factor in this one, not to mention his durability. But MM has a chance to win, if he can speed rush alot then maybe it would keep Thanos off balance to execute cosmic attacks., still siding with Thanos though.